(adjective, interjection)
A persian word meaning 'little one' or 'cute one' and signifying affection or endearment. It often can be used as sentence in itself. Often the final 'oo' sound at the end is drawn out. It can be used in reference to girlfriends or boyfriends, pets, actions taken by others, etc. See examples

Robin was running around asking everyone if they had seen his coat..... It was so kuchulu!
That kitten is kuchulu!
Kuchulu!!!!